***** NOT A TEACHER *****
(1) Thank you for posting this question, for it forced me to
learn some more of Shakespeare's wonderful language.
(2) The line "to be contracted in one brow of woe" comes from
Act l, scene ii, of "Hamlet."
(3) As you know, the word "brow" refers to your forehead.
(4) The book Shakespeare Major Plays (New York: Harcourt,
Brace and Company, 1948) edited by Professor G.B. Harrison
gives this explanation:
Every subject's forehead should be puckered with grief.
(a) In plain English, I think your quotation means something like this:
When the Parent Leader died, all the people in that country
showed their profound sadness by showing wrinkles in their
foreheads. (NOTE: Have you noticed that when a person is
super sad and s/he almost wants to cry, his/her forehead will
temporarily have wrinkles?)
(b) Or -- as a source on the Web said -- everyone in the kingdom
had a sad face.
Student or Learner